Summit Multi-purpose string thing pliers.
Firstly these pliers are great for cutting strings. They do a few more neat jobs. The rounded nose profile is used to bend over the cut edge of the string at the tuner post so that the sharp point of the string is facing the headstock. No more painful jabs in the hand plus no tears to the inside of the guitar case.
There is a “v” crimper in the jaw that is useful for putting a sharp kink in the string to aid the stringing of a Floyd Rose Tremolo. The “V” shape crimp in the string provides a greater clamping area for the string and makes it easier to position the string in the centre of the saddle clamp.